AP Biology: Thursday, 11/9/11Lab 5: Measuring Rates of Cell Respiration

Homework: Due Tuesday: Finish the pre-lab questions on page

3. Answer any analysis questions that you can (but

save graph for class) Start PS 9

Do Now: Get a lab preview worksheet and answer #1-4

Goal for Today: Design and carry out an experiment to measure

rates of cell respiration

AP Biology: Wednesday, 11/16/11Cellular Respiration

Homework: Work on PS 9 (due Friday)

Do Now: On an index card:1. What is one thing you learned how to do in Excel

yesterday that you didn’t know before? Describe how to do this.

2. What is one question you still have about manipulating data in Excel?

3. In what ways was the cold-temperature experiment yesterday sloppy? How could it have been improved?

Lecture: Cellular Energetics and Cell Respiration

Goals: By the end of class you will be able to: Define oxidation and reduction and

apply it to the cell respiration chemical equation

Describe the role of NADH and FADH2 in cell respiration (and the role of all the molecules in the chemical equation)

Describe how the 3 stages of cell respiration transfer energy and electrons from glucose in order to make ATP

Cellular Respiration: An Overview

Overall purpose:• Release energy from food in the form of ATP

for cells to useWhere it happens:• In the mitochondria of all eukaryotic cells• In aerobic bacteriaSummary equation:C6H12O6 + 6O2 6CO2 + 6H2O + energy (ATP + heat)

glucose + oxygen carbon dioxide + water + energy

Cell Respiration: A “Redox” Reaction

oxidation – the loss of electrons

reduction – the gain of electrons

LEO says GER

C6H12O6 + 6O2 6CO2 + 6H2Oe-

oxidation

reduction

Important Molecules inCell Respiration

• Glucose – provides energy and electrons• Oxygen – final electron acceptor• Carbon dioxide – low-energy waste product

from glucose oxidation• Water – low-energy waste product from oxygen

reduction• NADH and FADH2 – intermediate electron

carriers– Transfer electrons between stages of cell resp.

Outer membrane

Inner membrane

Inter-membrane space

Cristae (folds in inner membrane)

Matrix

AP Biology: Thursday, 11/17/11Cellular Respiration Details

Homework: Quiz tomorrow – you can bring one page (one side

only) of notes. Typed or hand-written, but on your own paper (not any handout I’ve given you)

PS 9 due Monday

Do Now: (in your mind or in your notebook)

1. What’s the difference between oxidation and

reduction?

2. What do NADH and FADH2 do in cell respiration?

3. What do you think “glycolysis” means?

Lecture: Cell Respiration Details

Goals: By the end of class you will be able to: Describe how the 3 stages of cell

respiration transfer energy and electrons from glucose in order to make ATP

Explain how cell respiration can happen in the absence of glucose, and in the absence of oxygen

Glycolysis:

P

Pglucose

(6 carbons) 2 pyruvate(3 carbons each)

splitting glucose

to ETS

Citric Acid Cycle (aka Krebs cycle)

intermediatestep

Oxidative Phosphorylation(ETS and Chemiosmosis)

e-e-

e- e-

Inspirational Video…

Then do the first side of the worksheet

Cell Respiration without oxygen:Anaerobic Respiration (Fermentation)

Cell Respiration without oxygen:Anaerobic Respiration (Fermentation)

Two Types of Fermentation:

both regenerate NAD+ so that glycolysis can continue

ALCOHOL FERMENTATION • in yeast cells and some bacteria• produces ethyl alcohol and CO2

LACTIC ACID FERMENTATION • in vertebrate muscle cells and some bacteria• produces lactic acid

AP Biology: Friday, 11/18/11Cellular Respiration

Homework: Problem Set 9 due Monday

Do Now:How do you think cell respiration can happen if a cell

runs out of glucose?

Today’s Agenda: Cell Respiration Wrap-Up Quiz

Cell Respirationwithout glucose!

Total ATP Production

Total ATP Production

Quiz

Work on your own for 20 minutes Use your 1 page of notes

Partner Check-in for last 10 minutes Confer with an assigned partner to

discuss/check your answers You may not use your notes for this part

Quiz Partners

Adel / ImadTalia / FatimaChristina / DjinnieDrishti / KlaraPoppy / RishabNehemie / KiraleahKimberly / Nicole Jasmine / Aaron